Blowpipe



July 28, 1925.

' J. HARRIS BLOVI'P IPE Filed June 30, 1923 2 Sheets-Sheet 1 Patented July 28, 1925.

UNITED STA some HARRIS, or cnavmam), 01110.

snowmen.

Application filed June 30, 1923. Serial No. 648,667.

To all whom it may concern:

Be it known that 1, JOHN HAnRIs, a citizen of the United States, residing at Cleveland, in the county of Cuyahoga and State of Ohio, have invented a certain new and useful Improvement in Blowpipes, of which the following is a full, clear. and exact description, reference being had to the accompanying drawings.

This invention relates to blow pipes for cutting and welding with gaseous fuel, and more particularly to the means for forming the mixture of oxygen with combustible gases. It is the general purpose and object of the invention to provide a construction and arrangement of the parts of the blowpipe head which will enable such head to is pressed into shape, instead of being formed of cast metal, thus eliminating the presence of sand holes, which frequently cause the leakage and escape of the highpressure gases used in such heads. A further object of the invention is to enable the mixing of the oxygen and the combustible gases to be accomplished in a most cflicient manner and with a minimum liability of flashing back. I accomplish these objects in and through the construction and arrangement of parts shown in the drawings forming a part of this application, wherein Fig. 1 1s a side elevation of a cutting blowpipe or torch embodying my invention; Fig.2 a sectional view corresponding to the line 2-2 of Fig. 1; Fig. 3 a plan view of the blowpipe or torch shown in the preceding views; Fig. 4 a sectional view corresponding to the line l-4 of Fig. 3; Fig. 5 a sectional view taken on the plane of the line 5-5 of Fig. 1, looking in the direction of the arrows; and Figs. 6 and 7 are sectional details, corresponding to the lines 66 and 7-7, respectively, of Fig. 4.

Describing the various parts herein by reference characters, 1 denotes the head of a blowpipe, the particular head and blowpipe shown herein being employed for the cutting of metal. This head is rovided'at its lower front end with a eylin rical chamher 2 and has its lower end externally threaded, as indicated at 3.

Projecting rearwardly from the chambered portion of the head is a narrow block ortion .4 having near the top thereof a horizontal passage 5 communicating at its front end with a passage 6, which in turn communicates with the central bore 8 of the inner tip member 7, which'member has an externally threaded end. 9 by means of which it is threaded into a recess 10 extending upwardly from the chamber 2. The ,inner tip member is provided with a cylindrical projection 11 which extends into the chamber 2 and is adapted to fit within the cylindrical upper end of the outer tip member fito be described hereinafter). The cylin rical projection is provided with a plurality of slots 12 (four such slots being I shown 1n Fi 6), each slot extending the full length of the projection and being preferably rectangular in shape. Below the projection 11, the inner member is provided with a projection 13, generally tapered. The lower end of the bore 8 is reduced, as shown at 8, and the tapered projection 13 is provided with a plurality of slotted passageways 14 surrounding the bore 8.

The slotted passageways 12 are arranged on opposite sides of the projection 11, and

this projection is flattened for a short distance at opposite sides thereof, as indicated at 11, below the nut by which the outer tip member is secured in place.

Fitting within the lower end of the cham-' ber 2 and contacting with the projections 11 and 13 of the inner member is the outer tip member, indicated generally at 15. The upper portion of the outer tip member is cylindrical and fits closely within the chamber 2, while the lower end fits snugly about the tapered lower end of the inner member. The outer member is secured in place by means of a nut 16 threaded on the lower end of the head and having a shoulder 17 projecting inwardly and engaging the outer tip member, there being a tapered packing ring 18 (preferably of copper) carried. by

the inner portion of the shoulder 17 and forced thereby into a tapered seat 19 provided within the lower end of the head 3.

Below the nut 17, the outer ti member is pressed inwardly on opposite sides thereof, as indicated at 15, toprovide a pair of inwardy extending lugs or looking members engaging the flattened surfaces 11 of the inner member and locking the two members securely together.

The detailed construction of the two tip members and the manner of mounting the same is set forth in my ap lieation No. 615,- 189, January 27, 1923' an it is shown herein as prescntin the best manner in which I now contemp ate applying my invention.

' 21 has a With the parts arranged as described, it will be evident that oxygen for cutting purposes will be supplied through the passages 5 and 6 to the central bore of the tip and that a mixture of gases will be conducted through the passages 12, the annular chamber 20, and the passages 14, to the delivery end of the tip. The manner in which the mixture of the oxygen and combustible gas is formed will now be described 21 denotes an upwardly inclined passage in the rear block 4 of the head and 22 is a similarly arranged but longer passage in said block. The passage 21 is for oxygen and the passage 22 for the combustible gas. Proj eoting from the block portion of the head is a lateral extension 23 which carries the plug and the mixing chamber and the passa eway which communicates with the charm r 2. The projection 23 is provided with a threaded bore 24 extending downwardly and inwardly from the topthereof and having a chamber 25' below. the threaded portion thereof from which chamber a passageway 26 extends downwardly and inwardly, dischargein into the chamber 2. The passage ateral branch 21 which communicates with the bore 24 and the passage 22 a lateral branch 22 which communicates with the upper portion of the chamber 25.

Mounted in the bore 24 is an injector plug 27 having a head 28 adapted to enga e a washer 29- interposed between the said cad and the top of the projection 23. This plug is provided with a cross dport 29 which receives the oxygen supplie through the passageway 21 and delivers the same to the bore 30 which extends to and through the bottom of the plug. The lower end of the plug is tapered, as shown at 27, and the delivery end of the passage 22, 22 communicates with the chamber 25 at the to of this tapered ortion, Pipes 31, 32 an 33 are connecte to the block 4 to deliver respectively oxygen to the passage 5, oxygen to the passage 21, 21 and combustible gas to the passage 22-22.

By the manner of constructing the head, the latter may be made to receive an injector plug and to be provided with a mixing chamber and mixing passage; and the head may be made of pressed or extruded metal, thus eliminating sand holes. Furthermore, this construction enables me, with the same depth of head block 4, to provide a, longer mixing passageway 26 than where the mixing tubes formed directly within the central portion of the head block, as shown in my Patent No. 1,408,194, issued February 28, 1922, and this longer passageway insures a complete mixture of the gases supplied to v the passageways 20.

Having thus described my invention, what I claim is 1. A blowpipe comprising a head having in the front thereof a mixing chamber, and a tip provided with passageways communicating with such chamber and extending block having at one sideof the passages therein a passageway extending downwardly and inwardly and deliverin into said chamber, the passages in ,said block communicating with the passageway therein.

2. A blowpipe comprising a head having in the front thereof a chamber and a tip provided with passageways communicating with such chamber and extending downwardly therefrom, the said head having a block extending rearwardly therefrom with a passage for oxygen and a passage for combustible gas in said block, and the said block havin at one side of the passages therein a pro ection having a downwardly extending bore with a chamber communicating with the lower end of said bore and a passageway extending downwardly and inwardly from said chamber and delivering into.

from said chamber and having passageways,

and means for sup-plying a mixture of oxygen and combustible gas to said chamber, said means comprising v a block extending rearwardly from the head and having therein a passage for oxygen and a passage for combustible gas, the said block having a projection, at one side of the said passages havin a downwardly and inwardly directs bore aving its upper portion internally threaded and havinga chamber in its lower portion with a downwardly and inwardly extending passageway leading from said chamber to the first mentioned'chamber, the passages in said block having lateral extensions communicating with said bore and with the lower or chambered portion thereof,-and an injector plug in said bore having itself a central bore adapted to receive gas from the upper passage in saidblock.

4. A blowpipe comprising a pressed metal head having a lateral projection provided with a mixing passageway and having passages for oxygen and a combustible gas communicating with said passageway, and a tip carried by said head and having one or more passages receiving the mixture formed in said passageway.

head. having a mixing chamber and a'tip provided with, passageways communicating with such chamber and extendin down- 5 wardly therefronn the said head aving a block extending rearwardly therefrom with a passage for oxygen and a passage for combustible gas in said block, and the said block having at one side of the passages therein a projection having apassageway extending downwardly and inwardly and deliverin into the mixing chamber, and means for de ivering to the passagewa s in said head the gases supplied throng the passages thereln.

In testimony whereof, I hereunto aflix my signature.

. JOHN HARRIS. 

